/Engine/Plugins/Experimental/PCG/Source/PCG/Public/PCGParamData.h
Creates an entry for the given name, if not already added
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=Params) int64 FindOrAddMetadataKey ( const [FName](API\Runtime\Core\UObject\FName) & InName )